The currency intervention carried out by the government and the Bank of Japan on 30 July was found to have totaled around ¥8 trillion, the largest on record. Coordinated US-Japan intervention was conducted for the first time in 28 years to curb the yen's weakness in late July, bringing the total amount of intervention this year to around ¥27 trillion.
The Ministry of Finance's announcement revealed the detailed intervention amounts, showing that the 30 July operation totaled ¥7.9756 trillion, the largest ever for a single day, followed by more than ¥5.5 trillion on 31 July and more than ¥1.8 trillion on 3 August.
The intervention was conducted to curb the yen's weakness, which had pushed the yen down to the ¥163-per-dollar level in late July.
The government and the Bank of Japan also intervened during Golden Week, bringing this year's total intervention to around ¥27 trillion.
Reports indicate that the yen remains at historically weak levels, and attention is focused on the effectiveness of coordinated US-Japan intervention.